Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended. Note: Click for Watch Status Reports.
SEL7
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 157
NWS Storm Prediction Center Norman OK
855 PM CDT Sun Apr 20 2025
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Northern Illinois
* Effective this Sunday night and Monday morning from 855 PM
until 400 AM CDT.
* Primary threats include...
A couple tornadoes possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...Associated with a line of storms, a brief tornado/wind
damage risk may develop east-northeastward across additional parts
of northern Illinois through mid/late evening.
The tornado watch area is approximately along and 30 statute miles
east and west of a line from 45 miles north northwest of Marseilles
IL to 75 miles south southeast of Marseilles IL. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU7).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 155...WW 156...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1 inch. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean
storm motion vector 22035.
...Guyer
SEL7
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 157
NWS Storm Prediction Center Norman OK
855 PM CDT Sun Apr 20 2025
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Northern Illinois
* Effective this Sunday night and Monday morning from 855 PM
until 400 AM CDT.
* Primary threats include...
A couple tornadoes possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...Associated with a line of storms, a brief tornado/wind
damage risk may develop east-northeastward across additional parts
of northern Illinois through mid/late evening.
The tornado watch area is approximately along and 30 statute miles
east and west of a line from 45 miles north northwest of Marseilles
IL to 75 miles south southeast of Marseilles IL. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU7).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 155...WW 156...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1 inch. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean
storm motion vector 22035.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW7
WW 157 TORNADO IL 210155Z - 210900Z
AXIS..30 STATUTE MILES EAST AND WEST OF LINE..
45NNW MMO/MARSEILLES IL/ - 75SSE MMO/MARSEILLES IL/
..AVIATION COORDS.. 25NM E/W /40NW JOT - 50WSW BVT/
HAIL SURFACE AND ALOFT..1 INCH. WIND GUSTS..60 KNOTS.
MAX TOPS TO 450. MEAN STORM MOTION VECTOR 22035.
LAT...LON 41978843 40368757 40368870 41978960
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU7.
Watch 157 Status Report Message has not been issued yet.
Probability of 1 or more strong (EF2-EF5) tornadoes
Low (10%)
Wind
Probability of 10 or more severe wind events
Low (20%)
Probability of 1 or more wind events > 65 knots
Low (10%)
Hail
Probability of 10 or more severe hail events
Low (<5%)
Probability of 1 or more hailstones > 2 inches
Low (<5%)
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
Mod (40%)
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The “Low” category contains probability values ranging from less than 2%
to 20% (EF2-EF5 tornadoes), less than 5% to 20% (all other probabilities),
“Moderate” from 30% to 60%, and “High” from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.
